	@media screen and (min-width:1200px) {
	  html {
	    font-size: 20px;
	  }
	}

	@media screen and (min-width:800px) and (max-width:1200px) {
	  html {
	    font-size: 16px;
	  }
	}

	@media screen and (max-width:800px) {
	  html {
	    font-size: 12px;
	  }
	}

	* {
	  margin: 0;
	  padding: 0;
	  box-sizing: border-box;
	}

	ul,
	ol {
	  list-style: none;
	}

	a {
	  text-decoration: none;
	}

	ul {
	  width: 40rem;
	  height: 4rem;

	  margin: 2.5rem auto;
	  background-color: black;
	}

	ul li {
	  width: 5rem;
	  height: 4rem;
	  float: left;
	  color: white;
	}

	ul li a {
	  display: block;
	  width: 5rem;
	  height: 4rem;
	  color: white;
	  text-align: center;
	  line-height: 4rem;
	}

	ul li:nth-child(4) {
	  float: right;
	  width: 4rem;
	  padding-top: 0.5rem;
	  font-size: 1.8rem;
	  cursor: pointer;
	}

	ul li a:hover {
	  background-color: rgba(255, 0, 0, .5);
	}

	ol {
	  width: 5rem;
	  height: 12rem;
	  background-color: darkgray;
	}

	ol .item {
	  display: block;
	  width: 5rem;
	  height: 4rem;
	}

	ol .item a {
	  color: black;
	}

	ol .item a:hover {
	  background-color: #CCCCCC;
	}